Mass spectra and peculiarities of the fragmentation of some substituted piperidines

N-Substituted piperidines with R = CH₂OCH₃, (CH₂)₄COCH₂, CH₃COOC₂H₅, (CH₂)₂N(CH₃)₂, (CH₂)₂N(C₂H₅)₂, N=0, CH₃, H, COOC₂H₅, and OH were investigated by mass spectrometry. The ratios of the intensities of the peaks and the behavior of the amine fragments with exocyclic double bonds attached to the quaternary nitrogen atom that are formed from the molecular ion by detachment of a radical from the C₂ atom and from the substituent attached to the nitrogen atom were studied. It is shown that the ratios of the intensities of the peaks of the amine fragments are determined both by the type of substituent and the energy of the ionizing electrons.Communication 11 from the series Application of mass spectrometry in structural and stereochemical studies. See 1] for Communication 10.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 221–228, February, 1981.